We are in upstate New York where winters can be well below freezing, with lots of snow and ice and very wet and slushy springs. We are restoring an 1880 Victorian that is quite large, and the walls have never been insulated. Because the plaster walls were in such disrepair, we gutted all the exterior walls and now are going to insulate from the inside. We are very interested in spray foam insulation but the trouble is we only know some of what we should and I'm not sure I'm entirely comfortable with it. I want to know if my concerns are founded or unfounded, and whether we should do spray foam or not.